Tardigrades Can Survive Extreme Radiation and Absolute Zero

Tardigrades measure less than 1 millimeter in size and live in moist environments like moss and lichen worldwide. When conditions become hostile, they enter a state of cryptobiosis—a deep hibernation where their metabolism drops to 0.01% of normal levels. In this state, they can survive for years or decades until conditions improve. Scientists have documented tardigrades surviving boiling temperatures for up to an hour, extreme drying, and pressures 1,000 times stronger than a hard fist punch. The key to their survival lies in specialized proteins and a unique gene called TDR1, which helps repair DNA damage from radiation exposure. Remarkably, when tardigrades exposed to massive radiation were brought back to normal conditions, they simply resumed living as if nothing had happened.